FREE · AUTO & TRAVEL
Jet Lag Calculator.
Estimate how many days you need to adapt to a new time zone and get a simple sleep and light plan for before and after your flight.
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How to use Jet Lag Calculator
Choose your home and destination time zones, the travel date, your usual sleep times and how many days to pre-adjust.
How it works
Offsets come from your browser’s time zone database for the travel date. Rule of thumb: about one day per zone eastward and two days per three zones westward.
Example
Paris to New York in October is 6 time zones westward: about 4 days to adapt, going to bed one hour later on each of the two days before.
Questions about Jet Lag Calculator
Is Jet Lag Calculator free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
General guidance, not medical advice. Everything is calculated in your browser; nothing you type is uploaded. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.